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This specification covers an aircraft-quality, low-alloy steel
in the form of bars, forgings, mechanical tubing, and forging
stock.

MAM 6415 is the metric version of this AMS.

These products have been used typically for parts, 3.5 inches
and under in nominal thickness at time of heat treatment, requiring
a through-hardening steel capable of developing a minimum hardness
of 40 HRC when properly hardened and tempered and also for parts of
greater thickness but requiring proportionately lower hardness, but
usage is not limited to such applications.

Certain design and processing procedures may cause these
products to become susceptible to stress-corrosion cracking after
heat treatment; ARP1110 recommends practices to minimize such
conditions.

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